Multi-family: verifying numbers

[Steven J.]

I've located a multiplex in my area but I'm not sure where to locate the information needed when investing in multi-family units. For example, is the selling agent going to have the information necessary to figure out what my income is and expenses are? Or do I need to go to the owner? I know I'll need access to the rent rolls, call up utilities to get estimates (I believe they won't tell me without owner consent), tax information, repairs needed.

And what recommendations do you experts have for verifying what the seller is claiming the income and expenses are? I plan to trust, but also verify what I need to know.